The runway visibility decreased to less than 100 meters due to which flights could not depart as the permitted low visibility take off minima is 125 meters and 150 meters for various types of aircrafts.

"Due to this flights could not take off as per their schedule," the official said.

As the visibility improved, some flights took off but again operations were stalled when visibility dipped again, he said.

According to Met department, the visibility is likely to improve after 11 am.

On Thursday, 266 flights were affected due to poor weather conditions.